81 lines
1.9 KiB
Go
81 lines
1.9 KiB
Go
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// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package rpmpack
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import (
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"archive/tar"
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"fmt"
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"io"
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"io/ioutil"
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"path"
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"github.com/pkg/errors"
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)
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// FromTar reads a tar file and creates an rpm stuct.
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func FromTar(inp io.Reader, md RPMMetaData) (*RPM, error) {
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r, err := NewRPM(md)
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if err != nil {
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return nil, errors.Wrap(err, "failed to create RPM structure")
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}
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t := tar.NewReader(inp)
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for {
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h, err := t.Next()
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if err == io.EOF {
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return r, nil
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} else if err != nil {
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return nil, errors.Wrap(err, "failed to read tar file")
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}
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var body []byte
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switch h.Typeflag {
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case tar.TypeDir:
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h.Mode |= 040000
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case tar.TypeSymlink:
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body = []byte(h.Linkname)
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h.Mode |= 0120000
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case tar.TypeReg:
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b, err := ioutil.ReadAll(t)
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if err != nil {
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return nil, errors.Wrapf(err, "failed to read file (%q)", h.Name)
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}
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body = b
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default:
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return nil, fmt.Errorf("unknown tar type: %d, (%q)", h.Typeflag, h.Name)
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}
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mtime := uint32(h.ModTime.Unix())
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// Sometimes the tar has no uname and gname. RPM expects these to always exist.
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owner := h.Uname
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if owner == "" {
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owner = "root"
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}
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group := h.Gname
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if group == "" {
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group = "root"
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}
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r.AddFile(
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RPMFile{
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Name: path.Join("/", h.Name),
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Body: body,
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Mode: uint(h.Mode),
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Owner: owner,
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Group: group,
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MTime: mtime,
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})
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}
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}
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